Nuclear moments of indium isotopes reveal abrupt change at magic number 82
Vernon, A. R., Garcia Ruiz, R. F., Miyagi, T., Binnersley, C. L., Billowes, J., Bissell, M. L., Bonnard, J., Cocolios, T. E., Dobaczewski, J., Farooq-Smith, G. J., Flanagan, K. T., Georgiev, G., Gins, W., de Groote, R. P., Heinke, R., Holt, J. D., Hustings, J., Koszorús, Á., Leimbach, D., . . . Yordanov, D. T. (2022). Nuclear moments of indium isotopes reveal abrupt change at magic number 82. Nature, 607(7918), 260-265. https://doi.org/10.1038/s41586-022-04818-7
Gins, W. |
© 2022, The Author(s), under exclusive licence to Springer Nature Limited
In spite of the high-density and strongly correlated nature of the atomic nucleus, experimental and theoretical evidence suggests that around particular ‘magic’ numbers of nucleons, nuclear properties are governed by a single unpaired nucleon1,2. A microscopic understanding of the extent of this behaviour and its evolution in neutron-rich nuclei remains an open question in nuclear physics3,4,5. The indium isotopes are considered a textbook example of this phenomenon6, in which the constancy of their electromagnetic properties indicated that a single unpaired proton hole can provide the identity of a complex many-nucleon system6,7. Here we present precision laser spectroscopy measurements performed to investigate the validity of this simple single-particle picture. Observation of an abrupt change in the dipole moment at N = 82 indicates that, whereas the single-particle picture indeed dominates at neutron magic number N = 82 (refs. 2,8), it does not for previously studied isotopes. To investigate the microscopic origin of these observations, our work provides a combined effort with developments in two complementary nuclear many-body methods: ab initio valence-space in-medium similarity renormalization group and density functional theory (DFT). We find that the inclusion of time-symmetry-breaking mean fields is essential for a correct description of nuclear magnetic properties, which were previously poorly constrained. These experimental and theoretical findings are key to understanding how seemingly simple single-particle phenomena naturally emerge from complex interactions among protons and neutrons. ...
PublisherNature Publishing Group
Dataset(s) related to the publicationhttps://doi.org/10.5281/zenodo.6406949
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Additional information about fundingThis work was supported by ERC Consolidator Grant no. 648381 (FNPMLS); STFC grants ST/L005794/1, ST/L005786/1, ST/P004423/1, ST/M006433/1 and ST/P003885/1, and Ernest Rutherford grant no. ST/L002868/1; the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under grant DE-SC0021176; GOA 15/010 from KU Leuven, BriX Research Program No. P7/12; the FWO-Vlaanderen (Belgium); the European Unions Grant Agreement 654002 (ENSAR2); National Key R&D Program of China (contract no. 2018YFA0404403); the National Natural Science Foundation of China (no. 11875073); the Polish National Science Centre under contract no. 2018/31/B/ST2/02220. TRIUMF receives funding by a contribution through the National Research Council of Canada. The theoretical work was further supported by NSERC and the U.S. Department of Energy under contract DE-FG02-97ER41014. ...
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